What Ram for this please

[Roverlord off road spares]

My Sisters HP only has 512GB ram, I would like to install another 512 for her.
But it's an old one. Would I use 184 pin DRAM? I believe the bus speed is only 133Mhtz
but ram speed is usually backwards compatible. isn't it.
No we don't want to upgrde to another pc, just want more ram for her existing one
Thanks Mario

HP Pavilion 061 ES002AA-ABG a1355a 0qm0114RE101ASTER00
System Serial Number: AUD6130488 AP660
Enclosure Type: Desktop Processor a Main Circuit Board b 3.07 gigahertz Intel Pentium 4
16 kilobyte primary memory cache
1024 kilobyte secondary memory cache
64-bit ready
Hyper-threaded (2 total) Board: Hewleet-Packard Asterope 1.0
Bus Clock: 133 megahertz
BIOS: American Megatrends Inc. 3.07 01/27/2006 Drives Memory Modules c,d 160.03 Gigabytes Usable Hard Drive Capacity
38.45 Gigabytes Hard Drive Free Space

[Hard drive] -- drive 3
ST3160023AS [Hard drive] (160.04 GB) -- drive 0, s/n 5MT3SAWR, rev 3.43, SMART (http://www.belarc.com/smart.html) Status: Healthy 512 Megabytes Usable Installed Memory

Slot 'DIMM0' has 512 MB
Slot 'DIMM1' is Empty

[sheerluck]

According to this (http://www.datamemorysystems.com/dms-memory/hewlett-packard/pavilion-media-center-a1355a.htm) it needs DDR2 240 pin RAM. Maximum of 1gig per stick, 2gig total.

[Roverlord off road spares]

Thanks Dave I checked it out, but the link was for a media centre not Pavilion. I have run them an email to confirm.
thanks Regards, Mario

[sheerluck]

Thanks Dave I checked it out, but the link was for a media centre not Pavilion. I have run them an email to confirm.
thanks Regards, Mario

It actually says Pavillion Media Centre, which if you search on the HP website for the model number A1355A that you've given above, seems to be the full description that HP allocate to it.

[Aussie]

I've got a HP at home which has memory in it. It was a customers old rig that they didn't want when they upgraded. I'll check to see what type of memory it is when I get home. You can have it if its compatible

[Roverlord off road spares]

It actually says Pavillion Media Centre, which if you search on the HP website for the model number A1355A that you've given above, seems to be the full description that HP allocate to it.Thanks I thought 61 was the model, thanks
Mario